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s390/cio: ensure consistent measurement state

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Make sure that in all cases where we could not obtain measurement
characteristics the associated fields are set to invalid values.

Note: without this change the "shared" capability of a channel path
for which we could not obtain the measurement characteristics was
incorrectly displayed as 0 (not shared). We will now correctly
report "unknown" in this case.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2016-01-25 10:31:33 +01:00 committed by Martin Schwidefsky
parent 0d9bfe9123
commit 61f0bfcf80
2 changed files with 13 additions and 12 deletions
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13
drivers/s390/cio/chp.c
View File

@ -466,14 +466,11 @@ int chp_new(struct chp_id chpid)
ret = -ENODEV;
goto out_free;
}
/* Get channel-measurement characteristics. */
if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) {
ret = chsc_get_channel_measurement_chars(chp);
if (ret)
goto out_free;
} else {
chp->cmg = -1;
}
ret = chsc_get_channel_measurement_chars(chp);
if (ret)
goto out_free;
dev_set_name(&chp->dev, "chp%x.%02x", chpid.cssid, chpid.id);
/* make it known to the system */

12
drivers/s390/cio/chsc.c
View File

@ -1003,6 +1003,12 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp)
u32 data[NR_MEASUREMENT_CHARS];
} __attribute__ ((packed)) *scmc_area;
chp->shared = -1;
chp->cmg = -1;
if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
return 0;
spin_lock_irq(&chsc_page_lock);
memset(chsc_page, 0, PAGE_SIZE);
scmc_area = chsc_page;
@ -1023,11 +1029,9 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp)
scmc_area->response.code);
goto out;
}
if (scmc_area->not_valid) {
chp->cmg = -1;
chp->shared = -1;
if (scmc_area->not_valid)
goto out;
}
chp->cmg = scmc_area->cmg;
chp->shared = scmc_area->shared;
if (chp->cmg != 2 && chp->cmg != 3) {